CVE-2026-13322: Kubevirt

Low severity, CVSS 3.8. EPSS: 0.1% chance of exploitation in the next 30 days.

A flaw was found in KubeVirt's downward metrics virtio-serial server. The server reads guest requests using textproto.Reader.ReadLine(), which buffers input indefinitely until a newline character is received, with no length limit or read deadline. A user with access to a VM guest that has the downward metrics virtio-serial device configured can write a continuous byte stream to the device, causing unbounded memory allocation in the virt-handler process until it is OOM-killed.

Affected products

• Kubevirt Kubevirt: affected versions not specified
• Red Hat Openshift Virtualization: from 4, up to and including 4.22.0

Published 2026-06-26. Last modified 2026-07-06.